I think I’m getting the hang of OSM editing again. Back when I lived in West Seattle, I did a lot of OSM editing of the really-poorly aligned maps of my neighborhood. Once I moved to West Portal, I found OSM didn’t seem to need as much help in my neighborhood. I’m in a different neighborhood of San Francisco now, which the maps aren’t as good, but I’m hoping to improve them.

I’ve created a grouping (a “road route”) for Guadalupe Canyon Parkway: https://www.openstreetmap.org/relation/12291160. My hope is that I’ll learn how to do this correctly by editing a portion in an area that many editors know well, so that I can do things correctly when I’m in an area that most other folks don’t know well.

UPDATE: I created an item in Wikidata for this road (https://www.wikidata.org/wiki/Q105488967) and linked https://www.openstreetmap.org/relation/12291160 to it.

It's really nice that there's an easy way to put coordinates on a diary feed and all, but as near as I can tell, there's no easy way to filter diaries by geography, at least on the site. What I did in an attempt to see what's available is learned how to use Yahoo Pipes, then created something for (very roughly) the Pacific Northwest:
http://pipes.yahoo.com/robla/openstreetmappnw

I believe you should be able to create a clone and edit it if you want to set up a feed for your area.

I did my first serious batch of edits today. I installed both JOSM and Merkaater on my machine, and find myself more productive in Merkaater, so that's probably what I'll be sticking with. I've been filling in a lot of tertiary and secondary roads in West Seattle and Burien. Looking around at the standards used elsewhere in Seattle, it looks like some of the roads I marked as tertiary roads should probably be promoted to secondary roads, but I still need to hunt around.